Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Patent
1991-01-10
1992-05-19
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
160192, 160107, 160265, E06B 930
Patent
active
051139227
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a Venetian blind or similar shade for installation on a window in an inclined roof said window comprising a sash having side parts extending in the direction of the roof inclination, in which side parts tracks are provided for guiding a lower list of the shade, at its raising and lowering in proportion to the sash, the lower list being loaded in the direction of the lowering by at least one coil spring rotatably seated in a housing, an uncoiled part of the spring extending from one end of the lower list downwards in the track to a lower fixing point.
It is generally known to use Venetian blinds and similar shades e.g. roller blinds, folding blinds and roller shades for windows in an inclined roof but at low roof inclination, i.e. under approximately 20.degree., it is not possible to bring the lower list of the shade to its lowest position (lowered shade) without using auxiliary devices, because the friction between the side parts and partly slide shoes, by means of which the lower list is guided during the lowering, partly the shade itself such as the slats of a Venetian blind, becomes too high in proportion to the component of the gravity pull in the direction of lowering. Well-known devices are e.g. cords or spindles, but they are not very stable in their function.
From DE-Al-29 06 871 a roller shutter is known using coil springs to ensure the lowering. The roller shutter which is intended for outside installation, comprises a heavy frame with tracks opening towards the middle of the window for guiding the lower list of the shutter and at the bottom of the sash a coil spring is seated at each of the two corners, the axis of rotation of which is perpendicular to the plane of the shutter. The uncoiled parts of these springs are carried upwards in the guiding tracks and are fastened to the ends of the lower list whereby exerting a pull on the lower list and thus on the roller shutter against its lowered position. The arrangement with a heavy frame to hide the spring is not, however, suitable for installation on the inner side of a window, as it is too unwieldy and would reduce the effective light area of the window.
Further a roller blind for inside installation is known from U.S. Pat. No. 794.937 comprising a hollow lower list, in the middle of which a rotatable drum is seated with its axis of rotation oriented horizontally and perpendicular to the longitudinal direction of a lower list. On the drum two cords or bands are wound one above the other, e.g. steel bands, each of them extending from the drum to its own end of the lower list, from where it is guided downwards over guide rollers through the respective guiding track and fastened with its free end at bottom of the track. The drum is loaded in the direction of winding by a coil spring whereby, through the cords or bands, the lower list is permanently affected in the direction of lowering. The aim is to balance the effect of the spring on the rollers in the blind, so that the roller blind can remain in any desired position. In this construction the lower list must necessarily have a large cross section making it look clumsy and reducing the effective light area of the window, when the shade is raised.
The shade according to the invention differs from the above prior art in that at least one of the guiding tracks is formed in a profile list designed for installation on the inner side of the side part of the sash with the opening of the truck facing the outer side of the window, the housing of the coil spring being slidable in the track and connected to the proper end of the lower list and the axis of the coiled part of the spring seated in the housing being parallel to the longitudinal direction of the lower list.
By means of the invention several advantages are obtained compared to the prior art according to the above mentioned patents. The axis of rotation of the coil spring being parallel to the longitudinal direction of the lower list thus causing the spring to be turned upright, the profile list fixed on the side part of t
REFERENCES:
patent: 794937 (1905-07-01), Hopkins
patent: 4552196 (1985-11-01), Vecchiarelli
patent: 4744403 (1988-05-01), Hausmann et al.
Christensen Per B.
Sonderby Svend A.
Johnson Blair M.
V. Kann Rasmussen Industri A/S
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